Internet Engineering Task Force (IETF) R. Droms
Request for Comments: 7346 Cisco
Updates: 4007, 4291 August 2014
Category: Standards Track
ISSN: 2070-1721
IPv6 Multicast Address Scopes
Abstract
This document updates the definitions of IPv6 multicast scopes and
therefore updates RFCs 4007 and 4291.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc7346.
Droms Standards Track [Page 1]RFC 7346 IPv6 Multicast Address Scopes August 2014Copyright Notice
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1. Introduction
RFC 4291 [RFC4291] defines "scop" as "a 4-bit multicast scope value
used to limit the scope of the multicast group" and defines "scop 3"
as "reserved". The multicast protocol specification in [MPL] desires
to use multicast scop 3 to transport multicast traffic scoped to a
network of nodes connected in a mesh. This scop value is used to
accommodate a multicast scope that is greater than Link-Local but is
also automatically determined by the network architecture.
Droms Standards Track [Page 2]RFC 7346 IPv6 Multicast Address Scopes August 20142. Definition of IPv6 Multicast Address Scopes (Updates RFC 4291)
The following table updates the definitions in [RFC4291]:
+------+--------------------------+-------------------------+
| scop | NAME | REFERENCE |
+------+--------------------------+-------------------------+
| 0 | Reserved | [RFC4291], RFC 7346 |
| 1 | Interface-Local scope | [RFC4291], RFC 7346 |
| 2 | Link-Local scope | [RFC4291], RFC 7346 |
| 3 | Realm-Local scope | [RFC4291], RFC 7346 |
| 4 | Admin-Local scope | [RFC4291], RFC 7346 |
| 5 | Site-Local scope | [RFC4291], RFC 7346 |
| 6 | Unassigned | |
| 7 | Unassigned | |
| 8 | Organization-Local scope | [RFC4291], RFC 7346 |
| 9 | Unassigned | |
| A | Unassigned | |
| B | Unassigned | |
| C | Unassigned | |
| D | Unassigned | |
| E | Global scope | [RFC4291], RFC 7346 |
| F | Reserved | [RFC4291], RFC 7346 |
+------+--------------------------+-------------------------+
The following change is applied to Section 2.7 of [RFC4291].
OLD:
Admin-Local scope is the smallest scope that must be
administratively configured, i.e., not automatically derived from
physical connectivity or other, non-multicast-related